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38results about How to "Reduce banding" patented technology

Production method of high H2S corrosion-resistant petroleum well casing pipe J55

The invention discloses a production method of a high H2S corrosion-resistant petroleum well casing pipe J55. The production method comprises the processes of steel making, continuous casting, heating, rolling, coiling, uncoiling, pipe making and heat treating. According to the production method of the high H2S corrosion-resistant petroleum well casing pipe J55, on the component design, low-content C, low-content P and low-content S are adopted to reduce banded segregation, and cracking and temper brittleness tendency are reduced; the low-temperature toughness and the welding corrosion resistance of steel are improved through low-content O, low-content N and low-content H; Nb, Cr and Mo are added to form a passivation film, hydrogen is prevented from entering the passivation film, and thenthe effect of effectively inhibiting the hydrogen sulfide corrosion rate is achieved; and a TMCP rolling technology is adopted and combined with a low-temperature rolling technology, therefore, it isguaranteed that austenite phase transformation is generated at low temperature, ultrafine ferrite structures are obtained, and then production of the high H2S corrosion-resistant petroleum well casing pipe J55 is achieved. According to the production method, the safety performance of the petroleum well casing pipe industry is greatly improved, and the production method has the characteristics ofbeing low in product cost, excellent in comprehensive performance and the like.
Owner:HANDAN IRON & STEEL GROUP +1

Continuous pipe resistant to H2S corrosion and manufacturing method thereof

InactiveCN105840919AAvoid gatheringSolve the problem of faster failureRigid pipesCrazingManganese
The invention discloses a continuous pipe resistant to H2S corrosion and a manufacturing method thereof. The continuous pipe comprises following material by mass percent such as C of 0.03-0.06 %, Si less than or equal to 0.152 %, Mn of 0.15-0.55%, P less than or equal to 0.01, S less than or equal to 0.003, Cr of 0.2-0.6 %, Mo less than or equal to 0.02, Ni of 0.1-0.27%, V of less than or equal to 0.06%, Ti of less than or equal to 0.03%, Nb of 0.05-0.09%, and the balance Fe. The continuous pipe resistant to H2S corrosion helps to solve the problem that an existing steel continuous pipe loses efficacy at a quick pace in an acid environment.The low-carbon low-manganese continuous pipe resistant to H2S corrosion has great intensity, plasticity and corrosion resistance.While meeting the mechanical properties of tubular products in the first place, banded segregation of parent material is substantially reduced by the low-carbon low-manganese alloying composition design so that defects are effectively reduced and H collection is prevented. The formation and expansion of cracks do not easily occur so that corrosion resistance of tubular products is remarkably improved. In the meantime, residual stress of tubular products by optimizing weld seams and carrying out thermal processing technology of parent material so that corrosion resistance is further enhanced.
Owner:BAOJI PETROLEUM STEEL PIPE
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